ab263bee19
git-svn-id: svn://svn.cy55.de/Zope3/src/cybertools/trunk@649 fd906abe-77d9-0310-91a1-e0d9ade77398
71 lines
No EOL
2.1 KiB
Python
71 lines
No EOL
2.1 KiB
Python
#
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# Copyright (c) 2005 Helmut Merz helmutm@cy55.de
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#
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"""
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interface definitions for the Relations utility and relation objects.
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$Id$
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"""
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from zope.interface import Interface, Attribute
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class IRelationsRegistry(Interface):
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""" Local utility for registering (cataloguing) and searching relations.
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"""
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def register(relation):
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""" Register the relation given with this registry.
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"""
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def unregister(relation):
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""" Remove the relation given from this registry.
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"""
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def query(**kw):
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""" Return a list of relations that fulfill the criteria given.
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Example: rr.queryRelations(first=someObject, second=anotherObject,
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relationship='a.dotted.name')
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"""
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class IRelation(Interface):
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""" Base class for relations.
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"""
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relationship = Attribute(
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'A string specific for a kind of relation; e.g. the full module '
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'path and class name of the class implementing a certain type of relation.')
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class IDyadicRelation(IRelation):
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""" Relation connecting two objects.
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"""
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first = Attribute('First object that belongs to the relation.')
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second = Attribute('Second object that belongs to the relation.')
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class ITriadicRelation(IDyadicRelation):
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""" Relation connecting three objects.
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"""
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third = Attribute('Third object that belongs to the relation.')
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